<template>
    <div class="cmt-container">
    <h3>发表评论</h3>
    <hr>
    <textarea placeholder="请输入要BB的内容（做多吐槽120字）" maxlength="120" v-model="msg"></textarea>

    <mt-button type="primary" size="large" @click="postComments">发表评论</mt-button>

    <div class="cmt-list">
      <div class="cmt-item" v-for="(item,i) in cmts" :key="item.i">
        <div class="cmt-title">
         
          第{{ i+1 }}楼&nbsp;&nbsp;用户：{{ item.username }}&nbsp;&nbsp;发表时间：{{ item.add_time | dateFormat }}
        </div>
        <div class="cmt-body">
            {{ item.content }}
        </div>
      </div>

    </div>

    <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
  </div>
</template>

<script>
import { Toast } from "mint-ui";
export default {
  data(){
    return {
      cmts:[], //自定义一个变量 接收 后台获取的数
      msg:""
    }
  },
  created(){
    // this.getComments();
    // localStorage.clear();
    this.cmts = JSON.parse(localStorage.getItem("cmt") || "[]");
  },
  methods:{
    //获取后台数据
    getComments(){
      this.$http.get("comment.json").then(reslut =>{
        if (reslut.body) {
          console.log(reslut.body);
          this.cmts = this.cmts.concat(reslut.body)//concat 拼接；
        } else {
          Toast("加载评论失败！！！");
        }
      })
    },
     getMore(){
    this.getComments();
  },
  //发表评论
  postComments(){
    //从本地存储中获取数据
    //JSON.parse()
    if(this.msg.trim() == "") return Toast("说的什么吧！！！！");
    var newlist = JSON.parse(localStorage.getItem("cmt") || "[]");
    var obj = {id:new Date(),add_time: new Date(),username:"匿名函数",content: this.msg}
    newlist.unshift(obj);//把评论的信息添加数组中
    // this.cmts = [...newlist,...this.cots];//评价两个数组
    this.cmts = newlist;
    localStorage.setItem("cmt",JSON.stringify(newlist));//将数组存到本地存储中
    this.msg=""
  }
  },
  //加载更多
 
 

}
</script>

<style lang="scss" scoped>
.cmt-container {
  h3 {
    font-size: 18px;
  }
  textarea {
    font-size: 14px;
    height: 85px;
    margin: 0;
  }

  .cmt-list {
    margin: 5px 0;
    .cmt-item {
      font-size: 13px;
      .cmt-title {
        line-height: 30px;
        background-color: #ccc;
      }
      .cmt-body {
        line-height: 35px;
        text-indent: 2em;
      }
    }
  }
}
</style>